oathbreaker
An oathbreaker is a person who intentionally fails to fulfill an oath, vow, or sworn duty. The term is used in legal, religious, political, and literary contexts to describe a breach of a formal promise. Etymology: a straightforward compound of oath and breaker; in English it has been used since the medieval period to denote someone who renounces commitments made under an oath.
Legal and institutional contexts: In secular law, an oath may underpin testimony or official duties. Violating
Religious and moral dimensions: Many faiths place strict emphasis on keeping vows. Oathbreaking is often framed
Fiction and modern usage: In literature and media, oathbreakers are a common archetype representing betrayal, loss
See also: perjury, breach of contract, loyalty, oath of allegiance, treason.